【多维精练】2016高考英语-阅读七选五集训（二）
【全国优秀高中英语名师】
甘肃庆阳 刘克炜
【多维精练】第二节（共5小题；每小题2分，满分10分）
根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
Passage 1
There are thousands of coral reefs(珊瑚礁) in the world; Unfortunately, however, they are now in serious danger. More than one-third are in such bad shape that they could die within ten years. 16 Here are the three main causes discovered.
The first cause is pollution on land. The pollutants run with rainwater into rivers and streams, which carry the poisons into the ocean. 17 So they will be easily infected(感染) with diseases.
18 Higher ocean temperatures kill the important food source(来源) for the coral—the algae, the tiny greenish-gold water plants that live on coral. 19 This process has happened more and more frequently in recent years.
The last factor contributing to the disappearance of coral reefs is people. People sometimes crash into reefs with their boats, breaking off large blocks of coral. 20 Moreover, some people even break coral off to collect for souvenirs since it is so colorful and pretty.
A. Global warming is another reason.
B. Many might not even last that long!
